Send statsd timing metrics in milliseconds

The statsd documentation indicates that timing values are expected to be in
milliseconds, not seconds:

  "The glork took 320ms to complete this time"
  https://github.com/etsy/statsd/blob/master/docs/metric_types.md#timing
Fix statsd test for millisecond times
Merge pull request #838 from mgood/statsd-timing

Send statsd timing metrics in milliseconds